package com.personal.mall.product.service.impl;

import com.personal.common.utils.BeanToTree;
import com.personal.mall.product.service.CategoryBrandRelationService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.personal.common.utils.PageUtils;
import com.personal.common.utils.Query;

import com.personal.mall.product.dao.CategoryDao;
import com.personal.mall.product.entity.CategoryEntity;
import com.personal.mall.product.service.CategoryService;
import org.springframework.transaction.annotation.Transactional;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {

    @Autowired
    CategoryBrandRelationService categoryBrandRelationService;

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> listWithThree(){
        //1、查出所有分类数据
        List<CategoryEntity> entities = baseMapper.selectList(null);
        //2、组装成父子的树形结构
        List<CategoryEntity> level1Menus = entities.stream()
                .filter(categoryEntity -> categoryEntity.getParentCid() == 0)  //先过滤出1级分类
                .map(categoryEntity -> {
                    categoryEntity.setChildren(getChildren(categoryEntity, entities));
                    return categoryEntity;
                }).sorted((menu1, menu2) -> {
                    return (menu1.getSort() == null ? 0 : menu1.getSort()) - (menu2.getSort() == null ? 0 : menu2.getSort());
                }).collect(Collectors.toList());
        return level1Menus;
    }

    @Override
    public void removeMenuByIds(List<Long> asList) {
        //TODO 检查当前删除的菜单在别的地方是否有引用
        baseMapper.deleteBatchIds(asList);
    }

    @Override
    public Long[] findCatelogPath(Long catelogId) {
        List<Long> paths=new ArrayList<>();
        List<Long> parentPath = findParentPath(catelogId, paths);
        Collections.reverse(parentPath);

        return parentPath.toArray(new Long[parentPath.size()]);
    }

    /**
     * 级联更新所有相关数据
     * @param category
     */
    @Transactional
    @Override
    public void updateCascade(CategoryEntity category) {
        this.updateById(category);
        categoryBrandRelationService.updateCategory(category.getCatId(),category.getName());

    }

    /**
     * 递归查找直指定的节点的父ID
     * @param catelogId
     * @param paths
     * @return
     */
    private List<Long> findParentPath(Long catelogId, List<Long> paths){
        //收集当前节点id
        paths.add(catelogId);
        CategoryEntity byId = this.getById(catelogId);
        if(byId.getParentCid()!=0){
            findParentPath(byId.getParentCid(), paths);
        }
        return paths;
    }

    //递归查找菜单的子菜单
    private List<CategoryEntity> getChildren(CategoryEntity root,List<CategoryEntity> all){
         List<CategoryEntity> children = all.stream()
                .filter(categoryEntity -> categoryEntity.getParentCid() .equals(root.getCatId()))
                .map(categoryEntity -> {
                    categoryEntity.setChildren(getChildren(categoryEntity, all));
                    return categoryEntity;
                }).sorted((menu1, menu2) -> {
                    return (menu1.getSort() == null ? 0 : menu1.getSort()) - (menu2.getSort() == null ? 0 : menu2.getSort());
                }).collect(Collectors.toList());
        return children;
    }

}